The Book of Transactions (Kitab Al-Buyu`)

Muslim :: Book 10 : Hadith 3683

Zaid b Thabit (Allah be pleased with him) reported that Allah's Messenger (may peace be upon him) gave concession in case of al-'ariyya transactions (for exchanging dates) for dates with measure. Yahya said: 'Ariyya implies that a person should buy fresh dates on the tree for his family to eat against a measure of dry dates.

Source materials are from the University of Southern California MSA site
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